<template>
    <div style="padding: 10px">
        <!--      功能区域-->
        <div style="margin: 10px 0">
            <el-button type="primary" @click="add()">新增</el-button>
        </div>
        <!--      搜索区域-->
        <div style="margin: 10px 0">
            <el-input v-model="search" placeholder="请输入关键字" style="width: 20%" clearable/>
            <el-button type="primary" style="margin-left: 10px" @click="load">查询</el-button>
        </div>
        <!--      数据展示-->
        <div id="data-div">
            <el-table :data="tableData" stripe style="width: 100%">
                <el-table-column prop="id" label="ID" sortable/>
                <el-table-column prop="name" label="书名"/>
                <el-table-column prop="price" label="价格"/>
                <el-table-column prop="author" label="作者"/>
                <el-table-column prop="createTime" label="出版日期"/>
                <el-table-column prop="total" label="数量"/>
                <el-table-column label="封面">
                    <template #default="scope">
                        <el-image
                                preview-teleported="true"
                                style="width: 100px; height: auto; object-fit: cover;"
                                :src="scope.row.cover"
                                :preview-src-list="[scope.row.cover]">
                        </el-image>
                    </template>
                </el-table-column>
                <el-table-column fixed="right" label="操作">
                    <template #default="scope">
                        <el-button plain type="primary" @click="handleEdit(scope.row)">编辑</el-button>
                        <el-popconfirm title="确认删除吗？" @confirm="handleDelete(scope.row.id, scope.row.cover)">
                            <template #reference>
                                <el-button plain style="color: red">删除</el-button>
                            </template>
                        </el-popconfirm>
                    </template>
                </el-table-column>
            </el-table>
        </div>


        <div style="margin: 10px 0">
            <el-pagination
                    :currentPage="currentPage"
                    :page-size="pageSize"
                    :page-sizes="[5, 10, 20]"
                    :small="small"
                    :disabled="disabled"
                    :background="background"
                    layout="total, sizes, prev, pager, next, jumper"
                    :total="total"
                    @size-change="handleSizeChange"
                    @current-change="handleCurrentChange"
            />

            <el-dialog
                    v-model="dialogVisible"
                    title="输入信息"
                    width="30%"
            >
                <el-form :model="form" label-width="120px">
                    <el-form-item label="书名">
                        <el-input v-model="form.name" style="width: 80%"/>
                    </el-form-item>
                    <el-form-item label="单价">
                        <el-input v-model="form.price" style="width: 80%"/>
                    </el-form-item>
                    <el-form-item label="作者">
                        <el-input v-model="form.author" style="width: 80%"/>
                    </el-form-item>
                    <el-form-item label="出版日期">
                        <el-date-picker v-model="form.createTime" value-format="YYYY-MM-DD" type="date"
                                        style="width: 80%" clearable></el-date-picker>
                    </el-form-item>
                    <el-form-item label="数量">
                        <el-input v-model="form.total" style="width: 80%"/>
                    </el-form-item>
                    <el-form-item label="封面">
                        <el-input v-model="form.cover" v-if="false"/>
                        <el-upload
                                ref="upload"
                                :auto-upload="true"
                                :on-success="fileUploadSuccess"
                                :on-remove="fileRemove"
                                action="http://localhost:9090/files/upload"
                                class="upload-demo"
                                list-type="picture"
                                :file-list='fileList'
                                :limit='1'
                                aceept='.jpg,.jpeg,.png'>
                            <el-button size="small" type="primary">点击上传</el-button>
                            <div slot="tip" class="el-upload__tip">只能上传图片格式文件</div>
                        </el-upload>
                    </el-form-item>
                </el-form>
                <template #footer>
                  <span class="dialog-footer">
                    <el-button @click="cancel">取消</el-button>
                    <el-button type="primary" @click="save()"
                    >确认</el-button
                    >
                  </span>
                </template>
            </el-dialog>
        </div>
    </div>
</template>

<script>

    import api from "../api/index"
    import {ElMessage} from "element-plus";

    export default {
        name: 'Book',
        components: {},
        data() {
            return {
                search: '',
                currentPage: 1,
                pageSize: 10,
                total: 0,
                tableData: [],
                dialogVisible: false,
                form: {},
                fileList: [],
                cover: '',  // 临时储存原图片的url
            }
        },
        created() {
            this.load()
        },
        methods: {
            fileUploadSuccess(res) {
                this.form.cover = res.data  // 上传成功后返回的url写入表单的cover
                this.$refs.upload.submit()  // 提交
            },
            fileRemove() {
                // 利用新图片的url取向服务器请求删除刚刚移除的图片
                let coverUrl = this.form.cover
                api.deleteFile(coverUrl).then(res => {
                    console.log(res)
                })
                this.form.cover = this.cover  // 移出图片时，将原图片的url填回去form的cover
            },
            load() {
                api.getBook({
                    params: {
                        pageNum: this.currentPage,
                        pageSize: this.pageSize,
                        search: this.search
                    }
                }).then(res => {
                    this.total = res.data.data.total
                    this.tableData = res.data.data.records
                })
            },
            add() {
                this.dialogVisible = true
                this.form = {}
            },
            save() {
                if (this.form.id) {  //更新
                    api.updateBook(this.form).then(res => {
                        this.handleResult_1(res, '更新成功', '更新失败')
                    }).catch(res => {
                        this.handleResult_2('更新失败')
                    })
                } else {    // 新增
                    api.addBook(this.form).then(res => {
                        this.handleResult_1(res, '新增成功', '新增失败')
                    }).catch(res => {
                        this.handleResult_2('新增失败')
                    })
                }
                this.cancel()
            },
            cancel() {
                this.dialogVisible = false
                this.form = {}  // 清空表单
                this.$refs['upload'].clearFiles()      // 清空上传文件列表
            },
            handleEdit(row) {
                this.form = JSON.parse(JSON.stringify(row))
                this.dialogVisible = true
                this.cover = this.form.cover
            },
            handleDelete(id, cover) {
                api.deleteBook(id).then(res => {
                    this.handleResult_1(res, '删除成功', '删除失败')
                    // 删除照片
                    api.deleteFile(cover).then(res => {
                    })
                }).catch(res => {
                    this.handleResult_2('删除失败')
                })
            },
            handleSizeChange(pageSize) {    // 改变当前每页的显示个数触发
                this.pageSize = pageSize
                this.load()
            },
            handleCurrentChange(pageNum) {    // 改变当前页码触发
                this.currentPage = pageNum
                this.load()
            },
            handleResult_1(res, msg1, msg2) {   // 提示操作成功或者失败
                if (res.data.code == "0") {
                    ElMessage({
                        message: msg1,
                        type: 'success'
                    })
                    this.load()    // 操作成功后重载数据
                } else {
                    ElMessage.error(msg2)
                }
            },
            handleResult_2(msg) {   // 操作异常时提示
                ElMessage.error(msg)
            }
        }
    }

</script>

<style>
    #data-div {
        width: auto;
        height: 550px;
        overflow: hidden scroll;
    }
</style>
